Coming to a Starbucks in New Jersey: Five guys huddled around a corner table with laptops open playing poker online. That was a scenario discussed at an Internet gambling conference last month in Philadelphia. “You’re going to have an informal clustering of people,” Joe Brennan, former chairman of iMEGA, an online-gaming association, predicted at the World Regulatory Briefing. “That’s natural social functioning,” he said. Does that mean poker players and slots addicts will flood free public Wi-Fi hot spots like Wegmans and Starbucks now that online gambling is legal in New Jersey? Will retailers allow it? Some will. Some won’t….